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Finding the Fourth Proportional to 80,869.60, 121,320.60 and 67,812.40

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Solution

The fourth proportional to 80,869.60, 121,320.60 and 67,812.40 is: 101,732.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,869.60 : 121,320.60 = 67,812.40 : x
  2. Step 2: Convert to fraction form
    80,869.60/121,320.60 = 67,812.40/x
  3. Step 3: Cross multiply
    80,869.60x = 121,320.60 × 67,812.40
  4. Step 4: Simplify right side
    80,869.60x = 8,227,041,055.44
  5. Step 5: Solve for x
    x = 8,227,041,055.44/80,869.60
  6. Step 6: Final answer
    x = 101,732.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.